Do the electrons follow defined paths around the nucleus

The probability of finding the electron in the space around the nucleus is given by-

(A) Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate (R): According to classical physics all moving electrons radiate

Which numbers indicate the probability of finding the electron in the space around the nucleus?

In the Bohr atom model the electrons move around the nucleus in circular orbits. Obtain an expression the magnetic moment (mu) of the electron in a Hydrogen atom in terms of its angular momentum L.

A Copper atom has 29 electrons revolving around the nucleus. A copper ball contains 4 xx 10^(23) atoms. What fraction of the electrons be removed to give the ball a charge of +9.6 mu C ?

According to Bohr's model of an atom, the electrons revolve round the nucleus in

How many time the normal electrons of hydrogen atom revolve round the nucleus in one sec? velocity of the electron